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Study on Reasonable Design States and Dynamic Characteristics of Extradosed Cable-stayed Bridges

Author: GuoWenLong
Tutor: HuangAnLu
School: Chang'an University
Course: Bridge and Tunnel Engineering
Keywords: Extradossed bridges Cable Force Optimization Dynamic characteristics Connectivity
CLC: U448.27
Type: Master's thesis
Year: 2011
Downloads: 42
Quote: 1
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Abstract


Dwarf tower cable-stayed main beam stiffness is relatively large , the stress state between the cable-stayed bridge with continuous beam bridge . The most common cable force optimization method based on conventional cable-stayed bridge is not entirely suitable for low tower cable-stayed bridge . In this paper, on the basis of in-depth study the optimization theory and bridges dynamic performance the dwarf tower cable-stayed dead load internal force optimization method and seismic performance conducted in-depth research . Whole that is successful bridge internal force state \The method successfully resolved Adjustment Cable final stage in the cable-stayed bridge , especially in the secondary tune into bridge cable process can only take into account the main beam main beam bending moment in the moment feasible region , while the main girder stress , especially in cross- stress exceeded the phenomenon . In the determination of the initial tension of the cable-stayed construction , REVERSE dress iterative method based on a finite number of steps , and construct the corresponding iterative equation . The this method REVERSE dress - REVERSE law suits iterative method , and the unity of the stress state law . Compared to non- stress state law , before the main beam folded without in order to ensure the main beam stress-free curvature continuous and conduct specialized cable force adjustment ; if adopted without stress cable long as the iteration variable , with simple being mounted iterative method , pour demolition method as dress down demolition method compared to the computer , you can save a lot of . The same time , due to the iterative equation does not explicitly REVERSE steps , without regard to the effect of shrinkage and creep nonlinear inverse when real bridge to verify that the method has a faster convergence efficiency and high accuracy . Detailed comparative analysis of the tower and beam consolidation , pier top seat , as well as the dynamic performance of the tower pier beam consolidation of links way , given both the two advantages of double thin-wall pier and pier cap beam top set tower Pier , the beam bottom set bearing beam connection method recommended . Internal force response , as well as the connection method can effectively reduce the main beam in the earthquake the main pier bending moments and plastic zone shear , to provide a reference for future large span low tower cable-stayed bridge tower pier beam link way set .

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CLC: > Transportation > Road transport > Bridges and Culverts > All kinds of bridges > Bridge: Structure > Cable-stayed bridge
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